You want a tuner or a custom dyno tune? Because I don't think a dyno tune is close to a grand. A company hosted tuning day where they uploaded a tune to the Optima and did a custom dyno tune for 700 bucks. I don't think just a custom tune will cost that much. Maybe 400 bucks?
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Asking around your forums is your best bet. I don't think you'll need new injectors or anything though. They should be able to bump power by maybe 10hp tops is my guess.Do they sell cams or heads for the tC?
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I keep hearing that bolt-ons won't really add/free up much HP unless you tune the car and despite of the fact that the car feels faster, I still have my doubts that it's just my mind playing games or wanting to believe that I'm faster. What do you guys know?
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You HAVE to get a tune if you plan on keeping the mods you have. Your engine probably isn't making stock power levels right now because it is freaking out because it's flowing better than normal.
=\/=DD: 1995 Mazda Miata M EditionToy: 04 Honda VFR800 Interceptor named Phoenix (nicknamed VTAK)

You also can't have a cat-back exhaust without a catalytic converter, which you said you don't have with the header you have...
=\/=DD: 1995 Mazda Miata M EditionToy: 04 Honda VFR800 Interceptor named Phoenix (nicknamed VTAK)